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        <p>[TOC]</p>
<h1 id="本章内容"><a href="#本章内容" class="headerlink" title="本章内容"></a>本章内容</h1><ul>
<li>检测浏览器对XML DOM的支持</li>
<li>理解JavaScript中XPath</li>
<li>使用XSLT处理器</li>
</ul>
<a id="more"></a>
<h1 id="浏览器对XML-DOM的支持"><a href="#浏览器对XML-DOM的支持" class="headerlink" title="浏览器对XML DOM的支持"></a>浏览器对XML DOM的支持</h1><h2 id="DOM2级核心"><a href="#DOM2级核心" class="headerlink" title="DOM2级核心"></a>DOM2级核心</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> xmldom = <span class="built_in">document</span>.implementation.createDocument(namespaceUri, root, doctype);</span><br></pre></td></tr></table></figure>
<h2 id="DOMParser类型"><a href="#DOMParser类型" class="headerlink" title="DOMParser类型"></a>DOMParser类型</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> parser = <span class="keyword">new</span> DOMParser();</span><br><span class="line"><span class="keyword">var</span> xmldom = parser.parseFromString(<span class="string">"&lt;root&gt;&lt;child/&gt;&lt;/root&gt;"</span>, <span class="string">"text/xml"</span>);</span><br></pre></td></tr></table></figure>
<h2 id="XMLSerializer类型"><a href="#XMLSerializer类型" class="headerlink" title="XMLSerializer类型"></a>XMLSerializer类型</h2><p>提供了和DOMParser相反的功能，将DOM文档序列化为XML字符串<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> serializer = <span class="keyword">new</span> XMLSerializer();</span><br><span class="line"><span class="keyword">var</span> xml = serializer.serializeToString(xmldom);</span><br><span class="line">coonsole.log(xml);</span><br></pre></td></tr></table></figure></p>
<h2 id="IE8及之前版本中的XML"><a href="#IE8及之前版本中的XML" class="headerlink" title="IE8及之前版本中的XML"></a>IE8及之前版本中的XML</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">createDocument</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                <span class="keyword">var</span> versions = [<span class="string">"MSXML2.DOMDocument.6.0"</span>, <span class="string">"MSXML2.DOMDocument.3.0"</span>,</span><br><span class="line">                                <span class="string">"MSXML2.DOMDocument"</span>],</span><br><span class="line">                    i, len;</span><br><span class="line">                                </span><br><span class="line">        </span><br><span class="line">                <span class="keyword">for</span> (i=<span class="number">0</span>,len=versions.length; i &lt; len; i++)&#123;</span><br><span class="line">                    <span class="keyword">try</span> &#123;</span><br><span class="line">                        <span class="keyword">var</span> xmldom = <span class="keyword">new</span> ActiveXObject(versions[i]);</span><br><span class="line">                        <span class="built_in">arguments</span>.callee.activeXString = versions[i];</span><br><span class="line">                        <span class="keyword">return</span> xmldom;</span><br><span class="line">                    &#125; <span class="keyword">catch</span> (ex)&#123;</span><br><span class="line">                        <span class="comment">//skip</span></span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        </span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">new</span> ActiveXObject(<span class="built_in">arguments</span>.callee.activeXString);</span><br><span class="line">        &#125;</span><br><span class="line">    </span><br><span class="line">    </span><br><span class="line"><span class="keyword">var</span> xmldom = createDocument();</span><br><span class="line">xmldom.async = <span class="literal">true</span>;</span><br><span class="line"></span><br><span class="line">xmldom.onreadystatechange = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (xmldom.readyState == <span class="number">4</span>)&#123;</span><br><span class="line">        <span class="keyword">if</span> (xmldom.parseError != <span class="number">0</span>)&#123;</span><br><span class="line">            alert(<span class="string">"An error occurred:\nError Code: "</span></span><br><span class="line">                  + xmldom.parseError.errorCode + <span class="string">"\n"</span></span><br><span class="line">                  + <span class="string">"Line: "</span> + xmldom.parseError.line + <span class="string">"\n"</span></span><br><span class="line">                  + <span class="string">"Line Pos: "</span> + xmldom.parseError.linepos + <span class="string">"\n"</span></span><br><span class="line">                  + <span class="string">"Reason: "</span> + xmldom.parseError.reason);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line"></span><br><span class="line">            alert(xmldom.documentElement.tagName);  <span class="comment">//"root"</span></span><br><span class="line">            alert(xmldom.documentElement.firstChild.tagName); <span class="comment">//"child"</span></span><br><span class="line">            </span><br><span class="line">            <span class="keyword">var</span> anotherChild = xmldom.createElement(<span class="string">"child"</span>);</span><br><span class="line">            xmldom.documentElement.appendChild(anotherChild);</span><br><span class="line">            </span><br><span class="line">            <span class="keyword">var</span> children = xmldom.getElementsByTagName(<span class="string">"child"</span>);</span><br><span class="line">            alert(children.length);   <span class="comment">//2        </span></span><br><span class="line">            </span><br><span class="line">            alert(xmldom.xml);                        </span><br><span class="line">        &#125;                </span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line">xmldom.load(<span class="string">"example.xml"</span>);</span><br></pre></td></tr></table></figure>
<h2 id="跨浏览器处理XML"><a href="#跨浏览器处理XML" class="headerlink" title="跨浏览器处理XML"></a>跨浏览器处理XML</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">parseXml</span>(<span class="params">xml</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">var</span> xmldom = <span class="literal">null</span>;</span><br><span class="line">    </span><br><span class="line">    <span class="keyword">if</span> (<span class="keyword">typeof</span> DOMParser != <span class="string">"undefined"</span>)&#123;</span><br><span class="line">        xmldom = (<span class="keyword">new</span> DOMParser()).parseFromString(xml, <span class="string">"text/xml"</span>);</span><br><span class="line">        <span class="keyword">var</span> errors = xmldom.getElementsByTagName(<span class="string">"parsererror"</span>);</span><br><span class="line">        <span class="keyword">if</span> (errors.length)&#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">"XML parsing error:"</span> + errors[<span class="number">0</span>].textContent);</span><br><span class="line">        &#125;        </span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (<span class="keyword">typeof</span> ActiveXObject != <span class="string">"undefined"</span>)&#123;</span><br><span class="line">        xmldom = createDocument();</span><br><span class="line">        xmldom.loadXML(xml);</span><br><span class="line">        <span class="keyword">if</span> (xmldom.parseError != <span class="number">0</span>)&#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">"XML parsing error: "</span> + xmldom.parseError.reason);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">"No XML parser available."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    <span class="keyword">return</span> xmldom;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>序列化xml<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">serializeXml</span>(<span class="params">xmldom</span>)</span>&#123;</span><br><span class="line">   </span><br><span class="line">    <span class="keyword">if</span> (<span class="keyword">typeof</span> XMLSerializer != <span class="string">"undefined"</span>)&#123;</span><br><span class="line">        <span class="keyword">return</span> (<span class="keyword">new</span> XMLSerializer()).serializeToString(xmldom);</span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (<span class="keyword">typeof</span> xmldom.xml != <span class="string">"undefined"</span>)&#123;</span><br><span class="line">        <span class="keyword">return</span> xmldom.xml;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">"Could not serialize XML DOM."</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="xpath"><a href="#xpath" class="headerlink" title="xpath"></a>xpath</h2><p>xml中节点的选择方法</p>

      
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